// 动态添加水印
$(function(){
	try {
		if (sessionLoginUserName) {
			watermark({ watermark_txt: sessionLoginUserName + "   " + sessionLoginUserAccount })//传入动态水印内容
		}
	}catch (e) {
		$.ajax({
			url : "/app/api/user/current",
			dataType : "json",
			success : function (result) {
				watermark({ watermark_txt: result.usrSteUsrId})//传入动态水印内容
			}
		});
	}
});


function watermark(settings) {
	var mask_div = document.createElement('div');
	mask_div.id = 'mask_div1';
	mask_div.style.position = "fixed";
	mask_div.style.left =  '-50px';
	mask_div.style.top =  '100px';
	mask_div.style.overflow = "hidden";
	mask_div.style.zIndex = "0";

	mask_div.style.opacity = 0.3;
	document.body.appendChild(mask_div);

	//默认设置
	var defaultSettings={
//      watermark_txt:"text",
		watermark_x:-50,//水印起始位置x轴坐标
		watermark_y:20,//水印起始位置Y轴坐标
		watermark_rows:0,//水印行数
		watermark_cols:0,//水印列数
		watermark_x_space:150,//水印x轴间隔
		watermark_y_space:100,//水印y轴间隔
		watermark_color:'#c7bebb',//水印字体颜色
		watermark_alpha:0.3,//水印透明度
		watermark_fontsize:'20px',//水印字体大小
		watermark_font:'微软雅黑',//水印字体
		watermark_width:150,//水印宽度
		watermark_height:60,//水印长度
		watermark_angle:9//水印倾斜度数
	};
	//采用配置项替换默认值，作用类似jquery.extend
	if(arguments.length===1&&typeof arguments[0] ==="object" )
	{
		var src=arguments[0]||{};
		for(key in src)
		{
			if(src[key]&&defaultSettings[key]&&src[key]===defaultSettings[key])
				continue;
			else if(src[key])
				defaultSettings[key]=src[key];
		}
	}

	var oTemp = document.createDocumentFragment();

	//获取页面最大宽度
	var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
	//获取页面最大长度
	var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);
//

	//如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
	if (defaultSettings.watermark_cols == 0 ||
		(parseInt(defaultSettings.watermark_x
			+ defaultSettings.watermark_width *defaultSettings.watermark_cols
			+ defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1))
			> page_width)) {
		defaultSettings.watermark_cols =
			parseInt((page_width
				-defaultSettings.watermark_x
				+defaultSettings.watermark_x_space)
				/ (defaultSettings.watermark_width
					+ defaultSettings.watermark_x_space));
		defaultSettings.watermark_x_space =
			parseInt((page_width
				- defaultSettings.watermark_x
				- defaultSettings.watermark_width
				* defaultSettings.watermark_cols)
				/ (defaultSettings.watermark_cols - 1));
	}
	//如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
	if (defaultSettings.watermark_rows == 0 ||
		(parseInt(defaultSettings.watermark_y
			+ defaultSettings.watermark_height * defaultSettings.watermark_rows
			+ defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1))
			> page_height)) {
		defaultSettings.watermark_rows =
			parseInt((defaultSettings.watermark_y_space
				+ page_height - defaultSettings.watermark_y)
				/ (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
		defaultSettings.watermark_y_space =
			parseInt((page_height
				- defaultSettings.watermark_y
				- defaultSettings.watermark_height
				* defaultSettings.watermark_rows)
				/ (defaultSettings.watermark_rows - 1));
	}
	var x;
	var y;
	for (var i = 0; i < defaultSettings.watermark_rows; i++) {
		y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
		for (var j = 0; j < defaultSettings.watermark_cols; j++) {
			x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j+Math.random()*100;

			var mask_div = document.createElement('div');
			mask_div.id = 'mask_div' + i + j;
			mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
			//设置水印div倾斜显示
			mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
			mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
			mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
			mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
			mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
			mask_div.style.visibility = "";
			mask_div.style.position = "fixed";
			mask_div.style.left = x + 'px';
			mask_div.style.top = y + 'px';
			mask_div.style.overflow = "hidden";
			mask_div.style.zIndex = "0";
			//mask_div.style.border="solid #eee 1px";
			mask_div.style.opacity = defaultSettings.watermark_alpha;
			mask_div.style.fontSize = defaultSettings.watermark_fontsize;
			mask_div.style.fontFamily = defaultSettings.watermark_font;
			mask_div.style.color = defaultSettings.watermark_color;
			mask_div.style.textAlign = "center";
			mask_div.style.width = defaultSettings.watermark_width + 'px';
			mask_div.style.height = defaultSettings.watermark_height + 'px';
			mask_div.style.display = "block";
			mask_div.style.pointerEvents="none";
			oTemp.appendChild(mask_div);
		};
	};
	document.body.appendChild(oTemp);
}

